[R] How to get the duplicated elements from a vector?

Leon Yee yee.leon at gmail.com
Wed Oct 29 15:19:54 CET 2008

Gustaf Rydevik wrote:
> Hi Leon,
> unique(x)
> or
> duplicated(x)
> should work, depending on what you want.
> Best,
> Gustaf

    Thank you all. Actually, I have a data frame or matrix, whose first 
column is numerical values, and whose 2nd column is names. I need those 
whose names repeated 3 times and get the mean of the 3 values for each 
repeated names.

    It sounds that I need some programming work.


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